What is the process of filtration of transformer oil and when is it required?

The process of filtration of transformer oil involves removing impurities, moisture, and particulate matter to enhance the oil’s dielectric strength and overall performance. This is typically achieved through vacuum filtration or using filter presses. Filtration is required during initial filling, after maintenance, or when oil quality deteriorates due to contamination. Regular filtration ensures the longevity and reliability of power transformers, preventing failures and maintaining operational efficiency.